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WiFi Security Advice - Windows - Cisco APs

Background:
Small school - 150 laptops using a fully Cisco AP wireless campus. (backbone
switches are 3com)
Currently Wifi has a SSID that is not broadcasted, but not WEP or WPA or
anything else for that matter. I know this is terrible and should never have
been set up this way but I took over this mess and want to fix it.
We currently push via GPO the SSID.

My question is -
Is there a way to implement some kind of security quickly and without having
to touch every laptop?

My school campus is all wireless and we have several AP's and none of them have any type of security. They are on a different subnet from the dorm's though so it does keep the people who reside there safe from Wardriving the director of IT says that we are a state school so anyone in the state should be able to use it or something dumb like that lol...

Anyways they do have systems that force you to agree to a disclosure before you can connect to the internet. Free WAPs use software like this all the time. For example Panara bread:

If you have never connected and you try to use the internet through something other than port 80 it is blocked. Now once you do use a browser it brings you to the agreement page and if you agree it adds your mac address to the ACL and you can now access the internet freely.

Now I am sure you can have a similar setup but with a password that only students and faculty know. So you need: a server to host the application and the software its self.

Problem being is I do not know who makes the software or what it is called.